Definition:Annulus (Geometry)/Also known as

Annulus: Also known as

The more contemporary word ring can sometimes be seen for annulus.

However, as the term ring is ubiquitous in the field of abstract algebra to refer to an algebraic structure of a particular type, it is the policy of $\mathsf{Pr} \infty \mathsf{fWiki}$ to use the term annulus instead, so as to reduce the possibility of confusion.

Sources

• 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): annulus: 1.